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<h1>页面布局结构及样式</h1>
<h2>页面布局一</h2>
<p class="note"><em>note:</em></p>
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<table class="table1" summary="The technical specifications of the Apple PowerMac G5 series">
  <caption>Table 1: Power Mac G5 tech specs</caption>
  <tr>
    <th scope="col" abbr="Configurations" class="nobg">Configurations</th>

    <th scope="col" abbr="Dual 1.8">Dual 1.8GHz</th>
    <th scope="col" abbr="Dual 2">Dual 2GHz</th>
    <th scope="col" abbr="Dual 2.5">Dual 2.5GHz</th>
  </tr>
  <tr>
    <th scope="row" abbr="Model" class="spec">Model</th>
    <td>M9454LL/A</td>

    <td>M9455LL/A</td>
    <td>M9457LL/A</td>
  </tr>
  <tr>
    <th scope="row" abbr="G5 Processor" class="specalt">G5 Processor</th>
    <td class="alt">Dual 1.8GHz PowerPC G5</td>
    <td class="alt">Dual 2GHz PowerPC G5</td>

    <td class="alt">Dual 2.5GHz PowerPC G5</td>
  </tr>
  <tr>
    <th scope="row" abbr="Frontside bus" class="spec">Frontside bus</th>
    <td>900MHz per processor</td>
    <td>1GHz per processor</td>
    <td>1.25GHz per processor</td>

  </tr>
  <tr>
    <th scope="row" abbr="L2 Cache" class="specalt">Level2 Cache</th>
    <td class="alt">512K per processor</td>
    <td class="alt">512K per processor</td>
    <td class="alt">512K per processor</td>
  </tr>

</table>



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